One way perpendicularity GD&T 1

[Raddy13]

I'm trying to set up the tolerance for this O-ring groove, and the O-ring catalog says the side wall can be 0 to 5 degrees outwards; i.e., the top of the groove can be wider than the bottom, but never narrower. Is there a way to represent this with a perpendicularity tolerance? I'm thinking not because the tolerance zone would allow for 0 to -5 degrees taper, but I'm very green with GD&T, so I thought I would double check.

 

[dgallup]

Checkerhater

All the process engineers and machinists in our shop and any job shop we have ever used will just machine it square. Never saw anyone use one of those inserts you linked too. However, all our o-rings are smaller than the minimum those tools can do so maybe there is an advantage to the angled sides for machining bigger grooves. The only place I've actually had angled o-ring grooves is on molded parts but deflashing the parting line is a PITA.

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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.

 

[ewh]

This seems like much ado about nothing... just following the recommended Parker scheme solves those GD&T problems. But of course, there are those that feel a part should be able to be completely defined using GD&T.
Perpendicularity is not the way to go.

“Know the rules well, so you can break them effectively.”
-Dalai Lama XIV